.nav {
  height: px2rem(64px);
  border-bottom: 1px solid #b2b2b2;
  width: 100%;
  position: fixed;
  top: 0;
  background-color: #fff;
  z-index: 999;
  .title {
    font-size: px2rem(17px);
    text-align: center;
    color: #2f2f2f;
    line-height: px2rem(84px);
  }
  .back-icon {
    width: px2rem(27px);
    height: px2rem(27px);
    background-image: url("./img/back.png");
    background-size: cover;
    position: absolute;
    top: px2rem(23px);
    left: px2rem(10px);
  }
}
